Kepler-1250 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1250 b is a confirmed super-earth exoplanet orbiting the star Kepler-1250, located approximately 6936.8 light-years (2126.85 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0323% across the stellar disk), this world measures 1.92 Earth radii and has a measured mass of 4.35 Earth masses. Combining its mass and radius yields a mean bulk density of 3.39 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.18 g⊕ (11.57 m/s²), and an escape velocity of 16.8 km/s.
In its orbital architecture around Kepler-1250, Kepler-1250 b completes one full revolution every 2.608 Earth days at a semi-major axis of 0.0393 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 164 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1431 K (+1158°C / +2116°F) and receiving 1,866.19 S⊕ (~2,539,889 W/m²), Kepler-1250 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1250 is classified as a stellar host with an effective photospheric temperature of 5,717 K, a radius of 0.98 R☉, a mass of 0.99 M☉, an estimated bolometric luminosity of 0.92 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.57 Gyr and a metallicity of [Fe/H] = 0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-1250 shines at apparent V-band magnitude 15.693 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | Kepler-1250 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,717 K |
| Stellar Radius | 0.9800 R☉ |
| Stellar Mass | 0.9900 M☉ |
| Bolometric Luminosity | 0.92 L☉ |
| Metallicity [Fe/H] | 0.040 dex |
| Stellar Age | 4.570 Gyr |
| Apparent Magnitude | V: 15.693 · G: 15.569 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.039300 AU |
| Orbital Period | 2.608 days |
| Mean Orbital Velocity | 164 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.1700° |
| Mean Bulk Density | 3.39 g/cm³ (16.8 km/s vesc) |
| Insolation Flux | 1866.1930 S⊕ (~2,539,889 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 6936.800 LY (2126.850 pc) |